Since its founding, the firm has attracted custom from large specialist retailers, ranging from sellers of women's underwear to consumer electronics. The company attributes its success to keeping a tight focus on online, rather than widening its offering to bricks-and-mortar business.

Published: December 17, 2015 -- 13:21 GMT (05:21 PST)

Photo by: Traffic Trends

Caption by: Michiel van Blommestein

9. Serengeti

Company: serengeti.hr

Country: Croatia

Founded: 2007

Growth: 843 percent

Business: Software development

Serengeti is an outsourcing/nearshoring software developer working mainly for companies in Western Europe.

The company particularly promotes its so-called 'Extended R&D Workbench'. The customer gets to work with the same team of Serengeti engineers from the start of the project to its completion, starting with a core team embedded in the client's business structure.

Team members are added as needs become more apparent as the project progresses. Serengeti also offers middleware services.

Published: December 17, 2015 -- 13:21 GMT (05:21 PST)

Photo by: Serengeti

Caption by: Michiel van Blommestein

​8. ITNT

Company: itnt.ro

Country: Romania

Founded: 2003

Growth: 933 percent

Business: Software downloading hubs

ITNT offers software download portals mainly aimed at the Romanian market. Its largest online collection is Soft32.com, which features downloads of free tools, trial versions of commercial software, and even service packs for Microsoft products.

7. High Tech Engineering Center

Company: htec.rs

Country: Serbia

Growth: 962 percent

Business: Software development, embedded software

Another software developer, High Tech Engineering Center (HTEC) serves customers in the EU and US.

Based in the Serbian capital Belgrade, HTEC claims a number of high-profile customers, which it attributes to its specialization in embedded systems and custom electronics. According to its website, HTEC serves customers from remote offices in Belgrade as well as through on-premise teams.

Published: December 17, 2015 -- 13:21 GMT (05:21 PST)

Photo by: High Tech Engineering Center

Caption by: Michiel van Blommestein

​6. ZebraPay

Company: zebrapay.ro

Country: Romania

Growth: 998 percent

Business: Payment processing

ZebraPay offers online payment services and has a network of over 1,000 payment processing terminals in Romania, mainly in the capital Bucharest.

The terminals allow for payment of bills, the topping-up of credit for mobile phones and Skype, and buying magazine subscriptions, without the need for a credit card. Since last year, ZebraPay also sells Bitcoin, in exchange for four percent on the prices of the coin-trading services.

Published: December 17, 2015 -- 13:21 GMT (05:21 PST)

Photo by: ZebraPay

Caption by: Michiel van Blommestein

​5. Netguru

Company: netguru.co

Country: Poland

Growth: 1,004 percent

Business: Mobile and web application development

Netguru is a developer of applications for web and mobile, working from seven locations in Poland.

The firm's portfolio consists of development of cloud-based software, mobile applications, and custom online systems. Much of its attention is focused on growing as a full-stack development house, with its roots in web development.

Published: December 17, 2015 -- 13:21 GMT (05:21 PST)

Photo by: Netguru

Caption by: Michiel van Blommestein

4. BSP Applications

Country: Slovakia

Company: bsp.sk

Growth: 1,004 percent

Business: Application development and deployment

The oldest company on the list is also one of the more traditional ones.

Founded in 1996, BSP is a developer and integrator of business applications and Microsoft's first partner in Slovakia. Besides development, BSP offers integration, document management, security and licensing.

Published: December 17, 2015 -- 13:21 GMT (05:21 PST)

Photo by: BSP Applications

Caption by: Michiel van Blommestein

3. Szallas.hu

Company: szallas.hu

Country: Hungary

Growth: 1,209 percent

Business: Accommodation-comparison website

Last month, Szallas.hu was acquired by a bank and a venture capitalist, with a view to accelerating its international expansion.

Already, revenue has exceeded €30m, and last summer Szallas.hu opened offices in Poland, Croatia, Romania, and Slovakia. Szallas.hu has profited mostly from the steep rise in the number of reservations conducted online. Szallas.hu was last year's leader in the Deloitte rankings.

Published: December 17, 2015 -- 13:21 GMT (05:21 PST)

Photo by: Szallas.hu

Caption by: Michiel van Blommestein

​2. SkyCash

Company: skycash.com

Country: Poland

Growth: 1,665 percent

Business: Mobile payments

SkyCash has been a permanent fixture in the Polish market for mobile payments since it was founded in 2008. By 2015, it has become the clear market leader in the country when it comes to paying for public transport, parking space, and cinema tickets.

It also claims to have more than two million users who make 500,000 transactions each month. The main revenue maker for the company is paid parking, for which SkyCash can offer over 90 percent coverage in the entire country. Over the years, SkyCash has improved usability and design of its app.

Published: December 17, 2015 -- 13:21 GMT (05:21 PST)

Photo by: SkyCash

Caption by: Michiel van Blommestein

​1. Simplity

Company: simplity.eu

Country: Czech Republic

Growth: 1,971 percent

Business: Data warehousing and business intelligence

The top spot in the region goes to Czech company Simplity, which has developed a software suite for data warehousing and business intelligence.

The company was founded by a former Czech Oracle employee and sells its suite, Accurity, to banks and telecoms companies worldwide.

Besides Accurity, Simplity offers custom solutions based on technologies by Teradata, Oracle, Sybase, and Microsoft SQL, among others. This year, Simplity is earning revenues of CZK 100m (€3.7m), up from CZK 82m (€3.03m). The company currently has premises in Prague and Brno, and next year is planning to open offices in Silicon Valley.

Double-digit growth does not get you a place at the top table of Central Europe's startups. To get a place on Deloitte's recent Central Europe rankings from its Technology Fast 50 report, which classes startups according to revenue growth between 2011 and 2014, you need triple-digit growth at least.. This year's top 10 features companies from all over the region.

Since its founding, the firm has attracted custom from large specialist retailers, ranging from sellers of women's underwear to consumer electronics. The company attributes its success to keeping a tight focus on online, rather than widening its offering to bricks-and-mortar business.